// Copyright (C) 2019 Leo Balter. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
description: >
    Short circuit if the CoalesceExpressionHead is not undefined or null (true)
esid: sec-conditional-operator
info: |
    ConditionalExpression :
        ShortCircuitExpression
        ShortCircuitExpression ? AssignmentExpression : AssignmentExpression

    ShortCircuitExpression :
        LogicalORExpression
        CoalesceExpression

    CoalesceExpression :
        CoalesceExpressionHead ?? BitwiseORExpression

    CoalesceExpressionHead :
        CoalesceExpression
        BitwiseORExpression

    Runtime Semantics: Evaluation

    CoalesceExpression:CoalesceExpressionHead??BitwiseORExpression

    1. Let lref be the result of evaluating CoalesceExpressionHead.
    2. Let lval be ? GetValue(lref).
    3. If lval is undefined or null,
        a. Let rref be the result of evaluating BitwiseORExpression.
        b. Return ? GetValue(rref).
    4. Otherwise, return lval.
features: [coalesce-expression]
---*/

function Test() {
    var x;

    x = undefined;
    x = true ?? 1;
    assert.sameValue(x, true, 'true ?? null');

    x = undefined;
    x = true ?? null;
    assert.sameValue(x, true, 'true ?? null');

    x = undefined;
    x = true ?? undefined;
    assert.sameValue(x, true, 'true ?? undefined');

    x = undefined;
    x = true ?? null ?? undefined;
    assert.sameValue(x, true, 'true ?? null ?? undefined');

    x = undefined;
    x = true ?? undefined ?? null;
    assert.sameValue(x, true, 'true ?? undefined ?? null');

    x = undefined;
    x = true ?? null ?? null;
    assert.sameValue(x, true, 'true ?? null ?? null');

    x = undefined;
    x = true ?? undefined ?? undefined;
    assert.sameValue(x, true, 'true ?? null ?? null');

    x = undefined;
    x = null ?? true ?? null;
    assert.sameValue(x, true, 'null ?? true ?? null');

    x = undefined;
    x = null ?? true ?? undefined;
    assert.sameValue(x, true, 'null ?? true ?? undefined');

    x = undefined;
    x = undefined ?? true ?? null;
    assert.sameValue(x, true, 'undefined ?? true ?? null');

    x = undefined;
    x = undefined ?? true ?? undefined;
    assert.sameValue(x, true, 'undefined ?? true ?? undefined');
}

// preheat
const NUMBER_OF_PREHEAT = 1;
for (let i = 0; i < NUMBER_OF_PREHEAT; i++) {
    Test();
}

ArkTools.jitCompileAsync(Test);
assert.sameValue(ArkTools.waitJitCompileFinish(Test), true, '[JIT] JIT disabled.');

// test
const NUMBER_OF_TEST = 1; // or 2
for (let i = 0; i < NUMBER_OF_TEST; i++) {
    Test();
}
